This result is in good agreement with the EDX result, as presented in Table 2, which showed that calcium is the main element that presents in the calcined chicken manure samples. On the other hand, the main peaks which are attributed to the CaO phase (i.e. 2h = 37.6 and 54.2) was observed in the calcined chicken manure samples, indicating that the CaCO3 phase was transformed to the CaO phase after calcination.